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JEE Main levelOne or more correct optionsDifficulty 2 of 3o2087

With HBr in the presence of a peroxide, which of the following alkene-product pairs are correct (major product)?

  1. Apropene gives 1-bromopropane
  2. B2-methylpropene gives 1-bromo-2-methylpropane
  3. Cbut-2-ene gives 2-bromobutane
  4. Dstyrene gives

Answer: A, B, C

In the first three, adds to the carbon that gives the more stable radical (terminal carbon for propene and 2-methylpropene, either carbon for symmetrical but-2-ene), so they are correct. For styrene, adds to the terminal carbon giving the benzylic radical, so the product is , not the Markovnikov isomer.
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